Part of living in a valley, is dealing with temperature inversions. Simply stated, a temperature inversion is when temperature increases with altitude in the troposphere. Temperature inversions can occur in any layer of the atmosphere, but when they occur in the troposphere, the lowest layer of the atmosphere, they greatly impact air quality.
Well, a slider is different from the normal orographic storm we usually see in Reno. An orographic storm is a storm created by the mountains, where moisture from the Pacific Ocean condenses as is is pushed up the Sierra, producing rain or snow. A slider does not have a huge orographic component. It slides in from the North, and can be relatively short lived, but can create heavy precipitation.
Clouds form when the relative humidity is high enough that water vapor condense into small liquid droplets. And a glass of beer is actually just the inverse of that. In a beer, gas bubbles are surrounded by liquid beer, and in a cloud, gas surrounds a group of water droplets.
To be exact, the Northern Hemisphere officially began its tilt toward the sun at 9:30 pm on March 19th. This is the earliest equinox date since 1896. Meanwhile, south of the equator, autumn has begun.